Polini Big Evolution scooter performance parts

We're keen advocates of Polini performance parts here at Adrenalin and for good reasons. If you've been considering purchasing any of their latest Big Evolution products then the following should be of interest.

Adrenalin Pedstop's 27.7hp Polini 94cc Piaggio Zip SP

Polini's Big Evolution - A New Chapter in Scooter Tuning

2010 saw the release of Polini’s range of Big Evo kits for 50cc Piaggio and Minarelli engines intended solely for competition use. The product range consists of 70cc, 84cc and 94cc configurations created from a selection of cylinder and crank combinations. With a brand new cylinder design and a full range of components to complement the kit, Polini weren’t hanging around and were going all out to match the constantly evolving range of products that surface on an annual basis for these popular engines.

2010 brought home great results for us using the Big Evo 70cc engine in the UK BSSO series with our rider Josh Brown who won races and set new lap records including a new lap time at the Three Sisters racetrack in Wigan. And for the second year running Josh was able to take the BSSO championship and be crowned champion once again. The engine in Josh’s Zip was originally supplied by Polini as a fully built race engine. Further enhancements were made by us in conjunction with Darrell Taylor at 50ccTuning through ongoing development and adjustments to the performance of the engine to suit UK racetracks – bear in mind that the engine was originally set up by Polini technicians for use on the shorter Italian circuits.

Adrenalin's Polini Big Evolution 94cc Piaggio Zip SP Race Bike

2011 comes as a new year and with it the feeling of trying something new, so out came the Big Evo 94cc engine with a view to running it at a race meeting or two. Currently the 94cc engine can be seen fitted to our shop demonstrator for all to drool over.


The Big Evo 94cc Piaggio configuration comprises of a 52mm cylinder kit and a 44mm long stroke crankshaft giving an actual capacity of 93.39cc using the ACU formula (bore x bore x stroke x 0.785). The build started out with a major shopping list of components and includes a brand new set of crankcases. After seeing the odd case fail in the past, the decision to use new casings was a no brainer coupled with the fact that the engine has to be machined out to accept both the crank and cylinder – the most powerful and highest torque producing kit around. The crankcases also benefit from additional strengthening thanks to the new bolt-on Polini Torsen WD which reduces engine flex by making the casing dual sided.



Keep an eye on our blog... In future blog posts we'll take you through some of the engine work including crankcase preparation, additional porting work and water pump assembly.